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A garage has a stock of side mirrors. The ratio of right side mirrors to left side mirrors is 5:3. Iris, a garage worker, attaches pairs of left and right mirrors with an adhesive tape until no more pairs can be made. If 30 right mirrors are left unpaired, how many left and right mirrors are there in the stock?
A. 240
B. 120
C. 80
D. 75
E. 48
A. 240
B. 120
C. 80
D. 75
E. 48
04 May 2021, 08:02
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Ratio of left to right 5:3 means that left makes up 5/8 of the total and right makes up 3/8 of the total.
30 are left unpaired which means that 30 makes up 2/8 of the total (5/8 - 3/8).
30*4 = 120
Answer B
30 are left unpaired which means that 30 makes up 2/8 of the total (5/8 - 3/8).
30*4 = 120
Answer B
08 May 2021, 03:00
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Bunuel
\(\frac{right}{left}=\frac{5x}{3x}\).
30 right mirrors are left unpaired means that there are 30 more right mirrors than left mirrors: \(right - left = 5x - 3x = 30\) --> \(x = 15\).
\(Total = 5x + 3x = 8x=8*15=120\).
Answer: B.
